Also, there is a video on youtube that might help you as a "last resort" if no other solution works. Looks risky to me - but if nothing else helps you, it might be worthwile to have a look. http://www.youtube.com/watch?v=22T_gkkZj...Also, there is a video on youtube that might help you as a "last resort" if no other solution works. Looks risky to me - but if nothing else helps you, it might be worthwile to have a look. http://www.youtube.com/watch?v=22T_gkkZjmM

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What you are going to want to do first is to try reloading/updating the firmware. Follow instructions in this link. After updating let me know if you are still having a problem. Also, what are the warranty/return details?
Good luck.

If a reset does not work using the reset hole, then try this: First, back up all of your music and do this: Turn off the player and disconnect it from the computer. Then press and hold the play/puse button and turn it on simultaneously. The player should be in recovery mode. Scroll down and select format (all) and let it format. Then reload all of music back onto your player and it should work like new. Hope this helps!

this helped me as after it rebuilds the libary then it always froze on a song let the battery run out!this worked for me straight away and i had tried loads of other ideas this actually came from the tech guys !!!

Detach the player from the PC if it is connected, and turn off the player.

Detach the Zen player from your PC , and ensure that the Zen Sleek is turned off.

2. Connect the power supply to the player.
3. Hold down the Play/Pause button while inserting a paper clip into the Reset hole
underneath your player, beside the data/power connector. Keep on holding thePlay/Pause button while you release the Reset button. The Rescue Mode screen will
then appear.
4. After the recovery mode has started, release the Play/Pause button

It will display the following options.Clean Up
Scans the player and removes invalid links from its music library.
Does not affect music files themselves.Format (All)Caution! Erases all content!
Save a copy of your player's content before formatting.Reload OS/ FirmwareCaution! Erases your player's firmware.DO NOT select the Reload Firmware option unless you have access to a PC and you have downloaded the necessary firmware to install.Reboot
Reboots the device.

Apologies if this answer is offensively obvious. Try putting a paperclip or equally small object into the little reset hole at the bottom of the player if you haven't done so already. Mine froze a couple of times and it always worked.